﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ClassLibrary1
{
    public class Student
    {
        private readonly string StudentSex;

        public readonly string StudentName;

        internal static int StudentAge;

        protected int StudentScore;
    }

    internal class Teacher
    {
        public readonly string TeacherName;
    }
    //抽象类
    abstract class StudentFriend
    {
      abstract public void Name( );
    }
    //密封类
    sealed class Sealedc
    {
        public int x;
        public int y;
    }
    //修饰类
    class A
    {
        public static int i = 0;
    }
   

}
